This is an issue that existed in older versions of cpanel. I for certain that this has been fixed inside of the 11.24 version of cpanel, I am uncertain as to if this is fixed inside of 11.23 (currently our stable tree)

Staff Member

Upon attempting to reproduce the issue I was unable to experience the same symptoms when testing Horde. When I accessed webmail via the proxy sub-domain and clicked to load Horde the session allowed me to login to Horde normally and did not redirect to an unexpected location nor did it open to a URL that uses one of the two webmail ports (2095 for non-SSL or 2096 for SSL). This testing was performed using the latest EDGE build of cPanel version 11.25, at the time of writing this build was 11.25.0-EDGE_41121.

Please ensure your cPanel version is the latest for your build tree and that automatic updates are enabled. If using the latest version for your build tree, as seen on our downloads page, and if the issue persists please consider submitting a ticket. The link in my forums signature may be used to initiate a ticket submission.